Diatomite has a hardness of around 5.5 on the Mohs scale of hardness.
The mineral hardness scale is called the Mohs scale of mineral hardness, named after German geologist Friedrich Mohs who created it in 1812.
Limonite has a hardness of about 4 to 5.5 on the Mohs hardness scale.
Azurite has a hardness of 3.5 to 4 on the Mohs hardness scale.
Flint has a hardness of 7 on the Mohs scale of hardness.
The hardness is 3-4 on Mohs scale.
Nickel has a hardness of 4 on the Mohs scale.
Dolomite has a hardness of 3.5 to 4 on the Mohs hardness scale.
The Mohs scale is used to determine the relative hardness of minerals.
This scale is correctly called the Mohs scale. Scientists use this scale to measure a rock's hardness or softness. They can discover how hard a mineral or rocks is and drill in to it and find out more about it.
Aluminum Oxide is roughly 8.5 - 9.0 on the hardness scale.
Friedrich Mohs' hardness scale is simply known as the Mohs Scale of Mineral Hardness.